Spring-calipers



(No Model.)

E. s, FIELD.

SPRING GALIPER'S. No. 332,244. Patented Dec. 15, 1885.

Fig.1

UNITED STATES PATENT OFFICE.

EDWIN S. FIELD, OF SPRINGFIFILD, ASSIGNOR OF ONE-HALF TO JOSEPH M. DAVISAND JOHN G. SODERBERG, OF WORCESTER, MASSACHUSETTS.

SPRING-CALIPERS.

SPECIFICATION forming part of Letters Patent No. 332,244, dated December15, 1885.

Application filed September 17, 1884. Serial No. 143,319. (No model.)

To all whom it may concern.-

' Be it known that I, EDWIN S. FIELD, a citizen of the United States,residing at Springfield, in the county of Hampden and State ofMassachusetts, have invented a new and useful Improvement in SpringCalipers and Dividers and like Articles, of which the following is aspecification.

My invention relates to spring calipers having the bow or spring madeseparate from the legs; and the objects of my improvements are, first,to lessen the cost of manufacture; second, by making one bow or springsufficient for two or more tools. I attain these objects by themechanism illustrated in the accompanying drawings, in which Figure 1 isa top view of the bow before bending. Fig. 2 is a sectional view of aleg, one end armed with a hook; Fig. 3, a view of the calipersassembled; Fig. 4, a view of legs of different tools,- Fig. 5, a view ofbow and legs in the act of assembling.

Similar letters refer to similar parts throughout the several views.

The bow or springA is preferably cut from sheet-steel of suitablethickness, and the holes (2 punched or prepared before bending. At thepresent time in the manufacture of calipers the bow and legs are forgedin one piece, and when a bow breaks, as olten occurs, the whole forgingwith the labor thereon has to be thrown away.

In my invention, if a bow breaks, which is not as liable to happen, theloss is very small, as it is practicable to use better stock and obtaina better temper at a less cost for material, while the legs can be madeof a lower grade of steel or other material easier to work.

I have petitioned for and described my in vention as spring calipers anddividers. A difference in the shape of the legs 0 0 makes differenttools. Pointed straight legs, as h in Fig. 4, make dividers. One legbent as O in Fig. 3, with the other straight as G in Fig. 4, makes whatis called key-hole calipers, and so on. One bow will answer for alloombiuations, and it is my design to place them on the market with onebow and different-shaped legs, so the purchaser can make whatcombination he wishes without being to great expense, as is now thecase.

In assembling, the books I) b on the end of legs 0 O, as shown in b,Fig. 2, interlock in the aperture d of thebow A,which is left openenough from a true circle, as in Fig. 5, to give the necessary spring ortension. The legs are then brought together, the screw F pushed throughthe holes in the legsmade for its reception, and the nut E, Fig. 3, orother suitable contrivance, is screwed or put onto the screw F or itsequivalent. This holds them firmly in place,and they are ready for use.

I claim as my improvement 1. In calipers and dividers, the combinationof the spring A, provided with apertures d d, with the legs 0 0, formedwith hooks b b to enter said apertures, substantially as described.

2. In calipers and dividers, the combination of the legs 0 O, formedwith books I) b, and the interlocking spring A,provided with aperturesfor the reception of the hooks b b, with the screw F and nut E,substantially as described.

3. In calipers and dividers, the combination of the interlocking springAwit-h the legs 0 0, formed with books I) b, entering apertures in thespring,whereby said legs may be removed and others substituted therefor,substantially as described.

EDWVIN S. FIELD.

Witnesses:

RALPH W. ELLIs, THOMAS B. WARREN.

